Primary TCP/IP Port Assignments and Descriptions

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TCP/IP provides a total of 65,535 ports of which 1023 are considered to be well known ports. In reality the number of ports that are used by popular network clients and services consists of a much smaller subset of even the well known ports. The following table lists the functions of this subset.

PortAssigmentDescription
20FTPFile Transfer Protocol (Data) - The File Transfer protocol provides a mechanism for transferring specific files between network connected computer systems. Transfer is typically performed using the ftp client which provides a range of commands used to connect to a remote server for the purpose of uploading or downloading files. Most modern web browsers also have the ability to browse and downlaod files located on a remote FTP server. FTP uses TCP (rather than UDP) to transfer files so is considered to be a highly reliable tranport mechanism.
21FTP File Transfer (Control) - See Above
22SSH - Secure Shell
23Telnet
25SMTP - Simple mail Transfer Protocol
53DNS - Domain Name Server
69TFTP - Trivial File Transfer (UDP based)
80HTTP - Hypertext Text Transfer Protocol
110POP3 - Post Office Protocol
119NNTP - Network News Transfer Protocol
123NTP - Network Time Protocol
143IMAP4 - Internet Message Access Protocol, Version 4
161SNMP - Simple Network Management Protocol
443HTTPS - Hypertext Transfer Protocol Secure
2049NFS - Network File System